TY  - JOUR
AU  - Yuri Gurevich
TI  - Two notes on formalized topology
JO  - Fundamenta Mathematicae
PY  - 1980
SP  - 145
EP  - 148
VL  - 107
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/fm-107-2-145-148/
DO  - 10.4064/fm-107-2-145-148
LA  - en
ID  - 10_4064_fm_107_2_145_148
ER  -